Boiler grate and the like



Nov. 27, 1928.

A. H. KEMPER ET AL BOILER GRATE AND THE LIKE Filed Aug. 23, 1927 Patented Nov. 27, 1928.

UNITED STATES PATENT OFFICE.

ALBERT H. KEMPER AND WILLIAM H. DURKIN, OF DAYTON, OHIO.

BOILER GRATE .AND THE LIKE.

Application filed August 23, 1927.

This invention relates to improvements in boiler grates.

In the accompanying drawings which serve for illustrating the invention Fig. l is a view in longitudinal section of the improved grate as applied to a horizontal boiler; Fig. 2 is a view in cross section on line 2-2 of Fig. 1; Fig. 3 is a detail view showing a modification.

An object attained in the invention consists in an improved grate construction which is especially adaptable for horizontal boilers,

having particular reference to Scotch marine.

type of horizontal boilers, in which provision is made for the expansion and contraction of the metal at variable temperatures, for preventing Warping and breaking of any part of the grate structure which occurs frequently in ordinary grates in which no such provision is made.

A further object attained in the invention consists in a grate structure which can be more readily assembled, and removed and replaced in the boiler than grates of the usual construction.

Provision is also made in the improved grate for facilitating the circulation of air through the fire chamber and for efiecting consumption of the gases of combustion, thus to minimize fuel waste in unconsumed gases carried off as smoke.

To this end the improved grate, here shown as applied to a representative type of horizontal boiler, consists of opposite side bars 1, which are secured at their forward ends, as indicated at 2, to the fire box casing 3, the rear ends of the bars being secured to back bridge wall 4, which is supported on opposite rollers 5, resting on the bottom of the fire box. the back wall being free to move with the longitudinal expansion and contraction of the side bars 1, thus compensating for metal stresses which otherwise, without such provision, would tend to warping of the side bars and possible breaking of other parts of the grate structure.

For ready assembling, removing and replacing of the grate in the fire box, the grate bars 6 are arranged transverse of the fire chamber, the opposite ends of the grate bars Serial No. 214,940.

being supported freely on the side bars 1. The grate bars are thus shorter and lighter and can be more readily entered through the fire door and assembled in the fire box than the usual type of grate bar in boilers of this character which extend longitudinally of. the fire box.

As shown in Figs. 1-2 of the drawings the rear grate bar 6 is inclined upward from the supporting bars 1 for preventing banking of the fuel against the bridge wall, and serving to keep the grateadjacent the bridge wall open for free circulation of air from the cold air chamber under the fuel bed, thus to facili tate combustion of the fuel, and fuel gases. In the modifiedconstruction, illustrated in Fig. 3, the rear grate bar lies flat, and an air duct 7, extended from the cold air chamber upward over the bridge wall, is substituted for the inclined grate bar for the same purpose.

We claim as our invention:

1. In boiler grates the combination of. parallel side bars fixed at their forward ends and movably supported at their rear ends, to compensate for the contraction and expansion of the bars, a bridge Wall secured to and supporting the rearward ends of the side bars and movable therewith, and stationary grate bars extended transversely between and sup-' ]ported freely at their opposite ends on the side ars.

2. In boiler grates the combination of parallel side bars fixed at their forward ends and movably supported at their rear ends, to compensate for the contraction and expansion of the bars, a bridge wall secured to and supporting the rearward endsof the side bars and movable therewith, and stationary grate bars extended transversely between and supported freely at their opposite ends on the side bars, and an air duct combined with the bridge wall leading from the air space below the grate over the bridge wall into the air space above the fuel bed.

In testimony whereof, we aflix our signatures.

ALBERT H. KEMPER. WILLIAM H. DURKIN. 

